No numbers issued for July-Dec. 1870. In 1871-1872, 1876-1883 the issues for each two years were combined, giving 4 v. for two years in place of 4 v. annually
1880-1900 (v. 3-76) called ser. 2; 1901-1913 (v.77-129) called "3. sér."; Jan.-May 1914 (v. 130-131) called 4. ser